Membrane depolarization facilitates sperm entry, large fertilization cone formation, and prolonged current responses in sea urchin oocytes.

@article{McCulloh1987MembraneDF,
  title={Membrane depolarization facilitates sperm entry, large fertilization cone formation, and prolonged current responses in sea urchin oocytes.},
  author={David H. McCulloh and J W Lynn and Eggers Chambers},
  journal={Developmental biology},
  year={1987},
  volume={124 1},
  pages={177-90}
}
Depolarization of the sea urchin egg's membrane is required for two processes during fertilization: the entry of the fertilizing sperm and the block to polyspermy which prevents the entry of supernumerary sperm. In an immature sea urchin oocyte, the depolarization is very small in response to the attachment of a sperm. The purpose of this study was to determine whether the depolarization evoked by sperm attaching to an oocyte can facilitate sperm entry or induce the block to polyspermy… CONTINUE READING